Age 22 - 29. The period by which the safety net of school and parents are no more (or coming to an end) and the world is thrust upon you, forcing you to grow up. It's the period of individual growth and learning of the world--away from the shelter of parents. It includes feelings of angst, frustration, depression and forced evaluation of self. It is followed by the intrinsic need to have one's own family.
Friend #1 (Age 23): "I can't get a break in life!"
Friend #2 (Age 33): "You have to crawl before you walk...you're in the terrible twenties."